Build a cabinet in front of it.

A framed piece of artwork and a piano hinge! Saw that on a Sarah Richardson design show and it got high praise.

You could hang a pretty textile over it.

How about a freestanding 3-4 panel hinged divider/screens - could be in the obvious Shoji style or some other style.

you have to be careful about covering up electrical equipment, especially in a commercial application, you might want to talk to your local building official about what they would accept or electrical contractor for what they have done in the past.

We covered one with contact paper with a quiet design. Put a bow around the knob. This was in a rest room in a physician's office. It got a lot of compliments.

Check the code for sure - some municipalities do not allow you to cover them.